Investment in Real Estate - Summary Regarding Industrial Properties Included in Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Real Estate [Abstract]
Total Revenues						$ 7,007	$ 20,727
Property Expenses						(2,784)	(8,126)
Impairment of Real Estate						0	(2,652)
Depreciation and Amortization						(2,388)	(7,727)
Gain on Sale of Real Estate					$ 0	25,988	34,344
Income from Discontinued Operations	$ 11,246	$ 13,389	$ 1,011	$ 1,095	$ 0	$ 27,823	$ 36,566